Using the Capital Asset Pricing Model (CAPM) formula, we can calculate the beta of the stock:
Beta = (Expected return - Risk-free rate) / Market return - Risk-free rate)
Beta = (16.15% - 2.5%) / (13% - 2.5%)
Beta = 1.3
Therefore, the beta of the stock is 1.3. The answer is B. 1.3.